Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cab2b8fb490930…

MALICIOUS

PDF

35.5 KB Created: 2021-06-20 16:18:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bc07cab1d72cb90687387822216dc0c8 SHA-1: 8c3b15b87e4919d613fd99468f2a4082f3fe6d54 SHA-256: a8cab2b8fb490930d1c26c73dfacf2b3d9b72195812937dea92b368bfe2ef3e4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links disguised as offers for free in-game currency and hacks, a common lure for phishing and malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. The document body and extracted URLs point to a social engineering attack aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/safe-ways-to-get-free-robux-game-hack
    • https://bartonprivate.com.au/sites/default/files/files/get-free-spins-for-coin-master_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/minecraft-multiplayer-free_GM479516143.pdf
    • https://bartonprivate.com.au/sites/default/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-free-cards-2021_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/minecraft-hacks-wurst_GM479516143.pdf
    • https://bartonprivate.com.au/sites/default/files/files/install-free-game-coin-master_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-free-spins-app_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/free-links-for-coin-master_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-claim-free-spins_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/free-robux-real-working_GM431946152.pdf
    • https://bartonprivate.com.au/sites/default/files/files/roblox-free-robux-no-verification_GM431946152.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-hack-no-verification-no-signup_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-free-spins-hack_GM406889139.pdf
    • https://bartonprivate.com.au/sites/default/files/files/roblox-beeg-hack-download_GM431946152.pdf
    • https://bartonprivate.com.au/sites/default/files/files/earn-robux-by-watching-ads_GM431946152.pdf
    • https://bartonprivate.com.au/sites/default/files/files/roblox-all-free-stuff_GM431946152.pdf
    • https://bartonprivate.com.au/sites/default/files/files/get-free-tiktok-followers-no-verification_GM835599320.pdf
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-deals_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000319e.bin
eb2a59296360c30badeb03c453512fd89e8d3ab209addfa9805f51279acf05cd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319E 22860 bytes
font_01_sfnt_off00006521.bin
e15327b6169b4ddc9f8efc788d784a4a1403671e920f4818e2fd022ce8366b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 19196 bytes

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